Glossary of Terms and Acronyms Page 8 | 27 Comprehensive Trip Log (CTL) Paper or electronic forms used by haulers and waste tire facilities to document waste and used tire pickup or delivery transactions. Forms are submitted to CalRecycle and entered in the Waste Tire Manifest System database. Compression Molding Molding process in which the material is placed directly in the mold cavity and compressed to shape by closure of the mold. (ASTM D1566 – 21) Compression Set Residual deformation of a material after removal of the compressive stress. (ASTM D1566 – 21) Copolymer Polymer formed from two different monomers. (ASTM D1566 – 21) Cracker Mill A machine that tears apart scrap tire rubber by passing the material between rotating corrugated hardened steel rolls, reducing the rubber to various sizes. Crosslink Density Number of crosslinks per unit mass or volume of vulcanizate. DISCUSSION—The units of crosslink density will indicate whether it is per unit mass or per unit volume. (ASTM D1566 – 21) Crosslinking (the act of) Formation of chemical bonds between polymer chains to give a network structure. (ASTM D1566 – 21) Crumb Rubber CalRecycle defines crumb rubber as equal to or less than 6.3 mm (1/4 inch) in size. Crumb rubber is produced by size reducing the whole tires through additional granulators and classifiers. The Tire Industry Association Environmental Advisory Council considers 9.5 mm (3/8 inch) to 425 mm (40 mesh) as crumb rubber and defines the material as being derived by reducing scrap tires or other rubber into uniform granules with the inherent reinforcing materials such as steel and fiber removed along with any other type of inert contaminates such as dust, glass, or rock. Crumb Rubber Modifier (CRM) A general term for scrap tire rubber that is reduced in size and used as a modifier in asphalt paving materials.
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